Echinus Geyser in Yellowstone National Park, a rare acidic geyser and the largest in the world, has recently been observed actively erupting again for the first time since 2020.

The largest acidic geyser in the world, Echinus Geyser, is active again, with eruptions occurring every 2 to 5 hours, according to the USGS.

Echinus is the largest known acidic geyser on Earth.

Learn more about the Echinus Geyser at Yellowstone Park, which recently erupted, but may not sustain into the summer.

The geyser really came alive in fall 2017. From October 18 to November 10, 2017, Echinus consistently erupted roughly about every two to three hours. The activity then stopped with only one eruption ...

Yellowstone's Largest Acidic Geyser Wakes Up After Six Years, Blasting Water 30 Feet High ...

The ground at Yellowstone does not always move quietly, and sometimes it waits for years before suddenly coming back to life.

Learn how geologists at Yellowstone National Park clean up hot springs filled with litter, saving them from irrevocable damage.

Echinus Geyser in Yellowstone National Park’s Norris Geyser Basin is erupting again for the first time since 2020, after renewed activity began in early Februar ...